By Wesley A. Salandro, Joshua J. Jones, Visit Amazon's Cristina Bunget Page, search results, Learn about Author Central, Cristina Bunget, , Laine Mears, John T. Roth
Maximizing reader insights into the most recent learn findings and purposes of Electrically-Assisted Forming (EAF) – wherein metals are shaped below an electrical present box – this booklet explains how this type of approach produces speedy more suitable formability of metals past the level of thermal softening, and permits metals to be shaped to bigger elongation with decrease mechanical power in addition to taking into account light-weight brittle metals reminiscent of magnesium and titanium to be shaped with no exterior heating or annealing, allowing the more desirable use of those light-weight metals in design.
Including case reports that illustrate and help the theoretical content material and real-world purposes of the thoughts mentioned, this ebook additionally serves to complement readers figuring out of the underlying theories that impact electro-plastic behaviour.
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Additional info for Electrically Assisted Forming: Modeling and Control
Mears W. 3 EAF research timeline. The number of researchers and universities investing time and money into different aspects of EAF research has increased exponentially over the past decade deformation, a few phenomena occur simultaneously, thus transforming the material into an easier-to-deform state, known as the electroplastic effect. , electrons scatter off of interfacial defects within the lattice, such as voids, impurities, grain boundaries) . It is important to remember that this heating occurs on the atomic level (within the metal’s lattice), and although this contributes toward the overall heating of the workpiece, this temperature increase is not the same as the bulk temperature increase that is witnessed at the part’s surface (known as global or bulk heating).
As is the case with the substitutional impurities, the interstitial impurities also distort the bonds in the local region. • Grain boundaries mark the end of one lattice in a crystal structure and the beginning of another. The lattice structure consists of slip planes oriented in particular directions with respect to the local grain. Once into another grain boundary, the slip planes on either side of the grain boundary will be oriented with respect to the particular grain they are in, which will be different compared with the previous or next grain.
The overall impact of this effect can be significant or minimal, depending on the 28 2 Introduction to Electrically Assisted Forming direction of the flowing electrons and the direction of deformation. This aims to explain why the temperature of an EAF test, where electricity is applied during deformation, is less than a stationary electrical test, where the electricity is applied when no deformation takes place. In the EAF test, some of the energy is used to assist plastic deformation, instead of fully contributing toward resistive heating.